CN114614164A - Control method of heating film and temperature control system of battery pack - Google Patents
Control method of heating film and temperature control system of battery pack Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6572—Peltier elements or thermoelectric devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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Abstract
The invention relates to the technical field of batteries, and provides a control method of a heating film and a temperature control system of a battery pack. The control method of the heating film comprises the following steps: acquiring the current lowest temperature of the battery units in the battery pack; when the battery cell isWhen present minimum temperature is less than or equal to first preset temperature, control heating film is right the battery unit heating, just heating film is right need satisfy in the battery unit heating process: actual total power consumption Q of the heating filmGeneral assemblyLess than or equal to a preset rated total power consumption QForehead (forehead)A preset rated total power consumption QForehead (forehead)Accounts for the total electric quantity Q of the battery packBag (bag)1 to 20 percent of the total weight of the composition. According to the control method of the heating film, the actual total power consumption of the heating film is set to be smaller than the preset rated total power consumption, so that reasonable power consumption can be guaranteed on the basis of temperature uniformity of all positions of the battery unit, and the power supply quantity of the battery pack to the whole vehicle is guaranteed.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a control method of a heating film and a temperature control system of a battery pack.
Background
The charging and discharging performance of the conventional power battery can be obviously reduced in a low-temperature environment, and when the temperature is lower in winter, the temperature of the battery of an automobile provided with the power battery pack is usually reduced quickly after the automobile is stood outdoors for a whole night, so that the automobile cannot be started immediately, the battery needs to be heated first, and the available electric quantity is reduced during running.
Therefore, the heat preservation treatment of the power battery pack is very important.
Disclosure of Invention
The invention provides a control method of a heating film and a temperature control system of a battery pack, which are used for preserving the heat of the battery pack on the premise of guaranteeing the power performance of the battery pack.
In order to achieve the purpose, the invention provides the following technical scheme:
according to a first aspect of the present invention, there is provided a control method of a heating film, including:
acquiring the current lowest temperature of the battery units in the battery pack;
when the current lowest temperature of the battery unit is less than or equal to a first preset temperature, controlling a heating film to heat the battery unit, and heating the battery unit by the heating filmThe process needs to meet the following requirements: actual total power consumption Q of the heating filmGeneral assemblyLess than or equal to a preset rated total power consumption QForehead (forehead)Said predetermined rated total power consumption QForehead (forehead)Accounts for the total electric quantity Q of the battery packBag (bag)1 to 20 percent of the total weight of the composition.
According to the control method of the heating film, the heating film can timely perform temperature compensation on the battery unit by acquiring the current lowest temperature of the battery unit. It is understood that since the heating film has a small electric power, an energy saving effect can be achieved, and the problem of a large temperature difference between a portion of the battery cell located at the middle position and a portion located at the edge position in the conventional battery pack can be solved. Meanwhile, according to the control method of the heating film provided by the embodiment of the application, the actual total power consumption of the heating film is set to be smaller than or equal to the preset rated total power consumption, so that reasonable power consumption can be realized on the basis of ensuring the temperature uniformity of each part of the battery unit, and the power supply quantity of the battery pack to the whole vehicle is ensured.
According to a second aspect of the present invention, there is provided a control method of a heating film, including:
acquiring the current lowest temperature of the battery unit in each cavity in the battery pack;
when the current lowest temperature of the battery unit in the cavity is less than or equal to a first preset temperature, controlling a heating film in the cavity to heat the battery unit;
the heating film in each cavity needs to satisfy the following requirements in the process of heating the battery unit: actual total power consumption Q of the heating film in each chamberGeneral assemblyLess than or equal to a preset rated total power consumption QForehead (forehead)The preset rated total power consumption QForehead (D)Accounts for the total electric quantity Q of the battery packBag (bag)1% to 20%, wherein the actual total power consumption QGeneral assembly∑ i1 Qi, i being an integer greater than 1.
According to the control method of the heating film, the heating film can timely compensate the temperature of the battery unit by acquiring the current lowest temperature of the battery unit in each chamber. It is understood that since the heating film has a small electric power, an energy saving effect can be achieved, and the problem of a large temperature difference between a portion of the battery cell located at the middle position and a portion located at the edge position in each chamber of the conventional battery pack can be solved. Meanwhile, according to the control method of the heating film provided by the embodiment of the application, the actual total power consumption of the heating film in each chamber is set to be smaller than or equal to the preset rated total power consumption, so that the power can be reasonably used on the basis of the temperature uniformity of each position of the battery unit, and the power supply amount of the battery pack to the whole vehicle is ensured.
According to a third aspect of the present invention, there is provided a temperature control system of a battery pack, comprising:
the temperature detection module is used for acquiring the current lowest temperature of the battery units in the battery pack to form a temperature signal;
the control module is in signal connection with the temperature detection module so as to compare the temperature signal with a first preset value and form a result signal;
the heating module is in signal connection with the control module, the control module controls the heating module to heat the battery unit according to the result signal, and the heating module needs to meet the requirements in the process of heating the battery unit: actual total power consumption Q of the heating moduleGeneral assemblyLess than or equal to a preset rated total power consumption QForehead (D)Said predetermined rated total power consumption QForehead (forehead)Accounts for the total electric quantity Q of the battery packBag (bag)1 to 20 percent of the total weight of the composition.
In the temperature control system of battery package that this application embodiment provided, temperature detection module obtains the current minimum temperature of battery unit in the battery package, and control module compares the temperature signal that temperature detection module formed with first default, forms the result signal, and control module heats the battery unit in the battery package according to result signal control heating module. It should be noted that the temperature control system of the battery pack provided by the application can solve the problem that the temperature difference between the part of the battery unit located at the middle position and the part located at the edge position in the existing battery pack is large.
Meanwhile, the temperature control system of the battery pack provided by the embodiment of the application can ensure reasonable power consumption on the basis of temperature uniformity of each part of the battery unit by setting the actual total power consumption of the heating module to be less than or equal to the preset rated total power consumption so as to ensure the power supply amount of the battery pack to the whole vehicle.
Drawings
For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:
fig. 1 is a flowchart of a control method for heating a film according to an embodiment of the present disclosure;
fig. 2 is a flowchart of another heating film control method according to an embodiment of the present disclosure;
fig. 3 is a flowchart of another heating film control method according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a temperature control system of a battery pack according to an embodiment of the present application.
The reference numerals are explained below:
100. a temperature detection module; 200. a control module; 210. a BMS; 220. a relay; 300. the module is heated.
Detailed Description
The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, so it should be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.
In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.
The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.
Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.
The heat preservation scheme of present battery package is mainly at battery package inside or outside installation insulation material, but all is difficult to solve the battery package low temperature and stews the big problem of inside and outside difference in temperature.
Based on this, the embodiment of the application provides a battery pack thermal insulation scheme, a heating film is attached to a battery unit in a battery pack, a strategy for opening and closing the heating film is formulated, and when the temperature in the battery pack is reduced to a certain temperature value, the heating film is opened to heat the battery unit in the battery pack, so as to perform temperature compensation on the battery unit; when the battery cells in the battery pack reach a certain temperature, the heating film may be turned off.
It should be noted that, because the four sides of the battery unit are cooled rapidly, the heating film may be attached to the periphery of the battery unit in the battery pack, or the heating film may be attached to only one or several sides of the battery unit as required, which is not described herein again.
For example, the following description will be given by taking an example in which heating films are attached to four side surfaces of a battery cell.
In one embodiment, at least one chamber may be provided within each battery pack. Specifically, the battery pack includes only one cavity surrounded by the annular frame, and only one battery cell may be disposed in the cavity. At this time, the heating film is attached to the periphery of the battery cell to heat the battery cell. It is understood that the battery cell is formed by stacking a plurality of batteries, and when the battery cell is fixed using the end plates or the side plates, the battery cell is a battery module.
In another embodiment, multiple chambers may be provided within each battery pack. Particularly, the battery pack comprises an annular frame and a separator arranged inside the annular frame, the separator divides the inner space of the annular frame into a plurality of cavities, and batteries are placed in the cavities. At this time, the batteries in the cavities are collectively referred to as a battery unit, and a heating film may be attached to a portion of the battery unit corresponding to the inner wall of the annular frame, in other words, the heating film is attached to the periphery of the battery unit, so as to heat the battery unit.
It should be understood that, in the above two embodiments, since the electric power of the heating film is small, the energy saving effect can be achieved, and at the same time, the problem of large temperature difference glue at different positions of the battery unit in the existing battery pack can be solved.
Based on the two embodiments, the embodiment of the present application provides a control method of a heating film. As shown in fig. 1, a control method provided in an embodiment of the present application includes:
s101: acquiring the current lowest temperature of the battery units in the battery pack; it should be understood that the "first preset temperature" is a preset temperature value, and can be set according to requirements.
S102: and judging whether the current lowest temperature is less than or equal to a first preset temperature.
When the battery cell is in useWhen the former lowest temperature is less than or equal to the first preset temperature, executing step S103: the control adds the hotting mask and need satisfy to battery cell heating process: actual total power consumption Q of heating filmGeneral assemblyLess than or equal to a preset rated total power consumption QForehead (forehead)Predetermined rated total power consumption QForehead (D)Accounts for the total electric quantity Q of the battery packBag (CN)1 to 20 percent of the total weight of the composition.
It should be noted that, in the control method of the heating film provided in the embodiment of the present application, by setting the actual total power consumption of the heating film to be smaller than the preset rated total power consumption, the power can be reasonably used on the basis of ensuring the temperature uniformity of each location of the battery unit, so as to ensure the power supply of the battery pack to the entire vehicle.
It should be understood that the total charge Q of the battery packBag (bag)Namely the rated energy (KWh) of the battery pack, which is the total electric quantity that can be reached after the battery inside the battery pack is fully charged. The numerical value can be set according to the requirements of users, and the total electric quantity Q of the battery packs of different vehicle typesBag (bag)The same or different. Illustratively, total charge Q of the battery packBag (bag)Can be 20kWh, 30kWh, 75kWh, 100kWh, 150kWh, 200kWh or 300 kWh.
Due to a predetermined rated total power consumption QForehead (forehead)Accounts for the total electric quantity Q of the battery packBag (bag)1% -20% of the total charge Q of the battery packBag (bag)At 75KWh, a preset rated total power consumption QForehead (forehead)The value range of (A) is 0.75 KWh-15 KWh.
In one embodiment, the preset rated total power consumption QForehead (D)Accounts for the total electric quantity Q of the battery packBag (bag)1 to 5 percent of the total weight of the composition.
It should be noted that, this structural arrangement can further optimize battery package structure to avoid heating film power consumption too big, influence the power performance of battery package.
Please note that, with reference to fig. 1, when the current lowest temperature of the battery unit is greater than or equal to the first preset temperature, the step S104 is executed: the heating film is not activated. At this time, the battery cell is not heated.
In one embodiment, the actual total power consumption Q of the heating filmGeneral assemblySatisfies the following conditions:
Qgeneral assembly＝PGeneral assembly×TGeneral assembly
Wherein, PGeneral assemblyFor rated total power of the heating film, TGeneral assemblyThe total length of time the film is heated on.
Notably, PGeneral assemblyAnd TGeneral assemblyAre all variables, wherein PGeneral assemblyP denotes the power of the individual heating film, and n denotes the total number of heating films in the battery pack. Specifically, when the battery pack is prepared, the relationship between the total power of the heating film in the battery pack and the total opening time of the heating film needs to be considered, in a specific embodiment, the total opening time of the heating film is taken as a fixed quantity to select the heating films with different powers and the total number of the used heating films, or the total rated power of the heating film is set as a fixed quantity, that is, the heating film with a certain power is selected and the total number of the used heating films is set, so that the total opening time T of the heating film is enabledGeneral assemblyAre variables.
Of course, if T is usedGeneral assemblyAs a variable, note TGeneral assemblyThe product of Ptotal and Ptotal is less than the preset rated total power consumption QForehead (forehead). Due to this proportional relationship, at selected PGeneral assemblyAfter, TGeneral assemblyThere will be a maximum. By TGeneral assemblyFor example, the total time T for opening the heating film is a maximum value that can be selectedGeneral assemblyIt may be constituted by a plurality of parts, and in particular, the heating process of the heating film may be interrupted as necessary throughout the heating of the battery pack by the heating film, so that the heating film is intermittently heated or suspended.
It is understood that if the heating duration is too long, the internal temperature of the battery pack can be continuously increased, which can eventually cause thermal runaway of the battery cells, affect the service life of the battery pack, and significantly degrade the cycle performance of the battery cells. Therefore, the total time period T of turning on the heating film is requiredGeneral assemblyDecomposing to T by multiple intermittent heatingGeneral assembly。
Note that, throughout TGeneral assemblyWithin the time length, the heating time of the heating film and the heating time length can be as requiredAnd adjusting, wherein the heating time lengths of the heating film before and after each pause can be the same or different. Of course, the selection needs to be based on the overall heat preservation capacity of the battery pack, and on the premise that the current lowest temperature of the battery unit is always greater than the first preset temperature.
In one embodiment, when the current lowest temperature of the battery cell is less than or equal to the first preset temperature, as shown in fig. 2, the method for controlling the heating film to heat the battery cell specifically includes:
s201: starting the heating film;
the following steps are executed in a circulating way:
s202: judging the heating time T of the heating film1Whether it is greater than or equal to the first preset time length TaWhen T is1Is greater than or equal to a first preset time length TaIf yes, then step S204 is executed: suspending heating; when T is1Is less than a first preset time length TaThen, step S201 is performed, i.e., the heating state is maintained. It is to be understood that the first preset duration TaCan be set according to requirements.
S205: judging the heating time T of the heating film2Whether it is greater than or equal to a second preset time length TbWhen T is2Is greater than or equal to a second preset time length TbThen, step S201 is executed: starting the heating film and heating; when T is2Is less than a second preset time length TbStep S201, i.e., maintaining the heating state, is performed. It is understood that the second preset durationTbCan be set according to requirements.
It is noted that, when the above steps are performed cyclically, it is determined whether the total time period since the first heating is equal to the total time period of heating is equal to TGeneral assemblyIf the total time from the first heating is equal to the total time T of heatingGeneral assemblyStep S206 is executed to end the heating. Has, by definition, for the total duration since first heating and TGeneral assemblyThe relationship is determined, for example, as shown in FIG. 2, after step S202 is executed, if the total time since the first heating is less than the total time T of heatingGeneral assemblyThen step S205 is performed.
Of course, the determination process may also occur during the execution of step S202, i.e., during the heating of the battery cell using the heating film.
The control method is matched with a structure that the heating films are attached to the periphery of the battery unit, so that the battery pack can be actively insulated when the battery pack is placed at a low-temperature and heat-preservation working condition, and the temperature difference of the battery unit in the whole pack is controlled.
For more clear explanation of the control method provided in the embodiments of the present application, a specific example is now provided:
under the working condition of low-temperature shelf heat preservation, the heating film opening and closing strategy is as follows: when the current lowest temperature of the battery cell is less than or equal to a first preset temperature (such as 15 ℃), the heating film is started and continuously heated for T1(e.g., 0.5h), turn off the heating film; pause T2After (e.g. 1 hour), the system is started again and the process is circulated. Of course, care should be taken during the heating process that each time T is continuously heated1Whether the sum of (A) and (B) is less than TGeneral assembly(e.g., 4 h).
In an embodiment, please continue to refer to what is shown in fig. 2, the control method provided in the embodiment of the present application further includes:
in step S202, determination conditions are added, specifically: detecting the current lowest temperature of the battery unit, and judging whether the current lowest temperature of the battery unit is greater than a second preset temperature; when the current lowest temperature of the battery unit is greater than the second preset temperature, executing step S204: suspending heating; when the current lowest temperature of the battery cells is less than or equal to the second preset temperature, step S201 is executed: the heating film is turned on.
It should be noted that the current minimum temperature and the second preset temperature of the battery unit can be judged and matched with the current heating time length T1And the relation between the long Ta when first presetting to the better heating effect of assurance heating film, on guaranteeing the energy saving basis, effectively heat the battery package.
It should be understood that the second preset temperature is greater than the first preset temperature, for example, when the first preset temperature is 15 ℃, the second preset temperature is 25 ℃, of course, the second preset temperature may be set as required, and will not be described herein again.
In an embodiment, please continue to refer to the content shown in fig. 2, the control method provided in the embodiment of the present application further includes,
in step S205, a determination condition is added, specifically: detecting the current lowest temperature of the battery unit, and judging whether the current lowest temperature of the battery unit is less than or equal to a first preset temperature or not; when the current lowest temperature of the battery cells is less than or equal to the first preset temperature, executing step S204: suspending heating; when the current lowest temperature of the battery unit is greater than the first preset temperature, executing step S201: the heating film is turned on.
It is noted that, in step S205, the detection of the current lowest temperature of the battery cell may be performed in real time to more accurately control the heating film. Of course, the detection process may also be set to be performed intermittently according to the requirement, which is not described in detail.
It should be noted that the battery unit can be heated in time by matching with the judgment of the current lowest temperature of the battery unit, so that the heating effect of the heating film is better ensured, and the battery pack is effectively heated on the basis of ensuring energy conservation.
It should be understood that T1The relationship between the heating time and the first preset time Ta, and the relationship between the current lowest temperature of the battery unit and the second preset temperature affect the heating time T of the heating film every time1；T2The relationship between the second preset time length Tb and the relationship between the current lowest temperature of the battery unit and the first preset temperature influences the heating time length T of the heating film in each heating pause2。
Based on this, the heating time period T of each time1May be the same or different. Similarly, each time the heating time is suspended T2May be the same or different. Exemplarily, to heat the film for a heating time period TGeneral assemblyFor 4 hours and a total of four pauses during the entire heating process, the following description is made. The whole process is as follows:
when the current lowest temperature of the battery unit is less than or equal to a first preset temperature (15 ℃), heating the battery unit, wherein the first heating duration of the heating film is 1.5h, and then pausing for 0.5 h; heating the battery unit for the second time, wherein the heating film is heated for the second time for 1 hour, and then pausing for 0.3 hour; heating the battery unit for the third time, wherein the heating film is heated for the third time for 1 hour, and then pausing for 0.4 hour; and heating the battery cell for the fourth time, wherein the third heating time of the heating film is 0.5h, the fourth heating time is equal to 4h, and the heating is suspended.
It should be noted that the heating films around the battery cells are driven simultaneously, and certainly, the heating films on each side of the battery cells can be driven independently according to requirements, so as to adjust the temperature of the battery cells more flexibly, and keep the temperature of the battery cells uniform.
When the heating films of each side of the battery cell are individually driven, a plurality of temperature detection points may be provided in the battery cell to detect the current lowest temperature of the battery cell of the side. It is noted that the temperature detection for the battery cells may be performed in real time to more accurately perform the heating, or the lowest temperature of the battery may be detected at intervals.
In another embodiment, multiple chambers may be provided within each battery pack. Specifically, the battery pack comprises an annular frame and a partition arranged inside the annular frame, the partition divides the space in the annular frame into a plurality of cavities, and one battery unit is placed in each cavity. At this time, a heating film is attached to the periphery of the battery cell in each chamber to heat the battery cell.
Based on the two embodiments, the embodiment of the present application provides a control method of a heating film. It should be understood that the control method differs from the control method as shown in fig. 1 in that: control of how the film is heated in the plurality of chambers.
As shown in fig. 3, a control method provided in an embodiment of the present application includes:
s301: acquiring the current lowest temperature of the battery unit in each cavity in the battery pack;
s302: and judging whether the current lowest temperature is less than or equal to a first preset temperature.
When the current lowest temperature of the battery cells in the chamber is less than or equal to the first preset temperature, step S303 is performed: controlling a heating film in the cavity to heat the battery unit; when the current lowest temperature of the battery cells in the chamber is greater than the first preset temperature, step S304 is performed: the heating film is not activated.
It is noted that, in performing step S303, the heating film in each chamber needs to satisfy the following requirements in the process of heating the battery cell: actual total power consumption Q of heating films in each chamberGeneral assemblyLess than or equal to a preset rated total power consumption QForehead (forehead)Predetermined rated total power consumption QForehead (forehead)Accounts for the total electric quantity Q of the battery packBag (bag)1% to 20%, wherein the actual total power consumption
i is an integer greater than 1.
It should be noted that, in the control method of the heating film provided in the embodiment of the present application, the heating film may perform temperature compensation on the battery cells in each cavity in the battery pack, and since the electric power of the heating film is small, an energy saving effect may be achieved. Meanwhile, according to the control method of the heating film provided by the embodiment of the application, the actual total power consumption of the heating film in each chamber is set to be smaller than the preset rated total power consumption, so that reasonable power consumption can be realized on the basis of temperature uniformity of each part of the battery unit, and the power supply amount of the battery pack to the whole vehicle is ensured.
Illustratively, when there are four chambers in a battery pack, i-4, QGeneral assembly＝Q1+Q2+Q3+Q4More specifically, the actual total power consumption Q of the heating filmGeneral (1)Equal to the sum of the actual total power consumption in each chamber.
It should be noted that the heating films in each chamber may be driven individually or collectively, and will not be described herein.
The embodiment of the application also provides a temperature control system of the battery pack. As shown in fig. 4, a temperature control system of a battery pack according to an embodiment of the present application includes:
the temperature detection module 100 is configured to obtain a current lowest temperature of a battery unit in the battery pack to form a temperature signal;
the control module 200 is in signal connection with the temperature detection module 100, so that the temperature signal is compared with a first preset value to form a result signal;
It should be noted that, in the temperature control system for a battery pack provided in the embodiment of the present application, the current lowest temperature of the battery unit in the battery pack is obtained through the temperature detection module 100, the temperature signal formed by the temperature detection module 100 is compared with the first preset value through the control module 200 to form a result signal, and the control module 200 controls the heating module to heat the battery unit in the battery pack according to the result signal.
It should be understood that the temperature control system of the battery pack provided by the embodiment of the application can solve the problem that the temperature difference between the part of the battery unit located at the middle position and the part located at the edge position in the existing battery pack is large. Meanwhile, the temperature control system of the battery pack provided by the embodiment of the application can ensure reasonable power utilization on the basis of temperature uniformity of each part of the battery unit by setting the actual total power consumption of the heating module 300 to be smaller than the preset rated total power consumption so as to ensure the power supply amount of the battery pack to the whole vehicle.
In one embodiment, the temperature detection module 100 includes a thermistor.
It should be noted that the thermistor has a small volume, and is convenient to arrange in the box body of the battery pack, and the space utilization rate in the box body can be improved. Meanwhile, the thermistor can accurately measure the temperature of the battery unit, and is convenient for timely temperature compensation of the battery unit. Of course, the temperature detecting module 100 may have other structures, which are not described herein again.
In one embodiment, the control module 200 includes a BMS210(battery management system) and a relay 220, wherein:
the BMS210 is connected with the temperature detection module 100, and the BMS210 receives the temperature signal and compares the temperature signal with a first preset value to form a result signal;
the relay 220 is electrically connected with the BMS210, and the relay 220 is connected with the heating module 300 to control the heating module 300 to heat according to the result signal.
In one embodiment, the heating module 300 includes at least one heating film.
Illustratively, the turning on and off of the heating module 300 (heating film) is controlled by the BMS210, and when the temperature detection module 100 (thermistor) transmits a temperature signal of the battery cell to the inside of the BMS210 and the lowest temperature of the battery cell is less than or equal to a first preset temperature, the heating module is turned on, and the BMS210 transmits the signal to the relay 220 and then to the heating module through the relay 220.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A method of controlling a heating film, comprising:
acquiring the current lowest temperature of the battery units in the battery pack;
when the current lowest temperature of the battery unit is less than or equal to a first preset temperature, controlling a heating film to heat the battery unit, wherein the heating film is required to meet the following requirements in the heating process of the battery unit: actual total power consumption Q of the heating filmGeneral assemblyLess than or equal to a preset rated total power consumption QForehead (forehead)Said predetermined rated total power consumption QForehead (D)Accounts for the total electric quantity Q of the battery packBag (bag)1 to 20 percent of the total weight of the composition.
2. The heating film control method according to claim 1, wherein an actual total power consumption Q of the heating filmGeneral assemblySatisfies the following conditions:
Qgeneral assembly＝PGeneral assembly×TGeneral assembly
Wherein, PGeneral assemblyFor rated total power of the heating film, TGeneral assemblyThe total length of time the film is heated on.
3. A control method of a heating film according to claim 2, wherein the controlling of the heating film to heat the battery cell includes:
the following steps are executed in a circulating way until the total heating time is equal to TGeneral assembly：
Controlling the heating time T of the heating film1When T1 is greater than or equal to a first preset time Ta, the heating is suspended;
controlling the heating film heating pause time T2And when the T2 is greater than or equal to a second preset time Tb, starting heating the heating film.
4. The control method of a heating film according to claim 3, further comprising:
detecting the current lowest temperature of the battery unit, and when the current lowest temperature of the battery unit is higher than a second preset temperature, suspending heating, wherein the second preset temperature is higher than the first preset temperature.
5. A control method of a heating film according to claim 4, further comprising:
detecting the current lowest temperature of the battery unit, and when the current lowest temperature of the battery unit is less than or equal to a first preset temperature, starting the heating film.
6. A method for controlling a heating film according to any one of claims 3 to 5, wherein the total power rating P of the heating module isGeneral assemblyP × n, where P denotes the power of the individual heating films and n denotes the total number of heating films in the battery pack.
7. A method of controlling a heating film, comprising:
acquiring the current lowest temperature of the battery unit in each cavity in the battery pack;
when the current lowest temperature of the battery unit in the cavity is less than or equal to a first preset temperature, controlling a heating film in the cavity to heat the battery unit;
the heating film in each cavity needs to satisfy the following requirements in the process of heating the battery unit: actual total power consumption Q of the heating film in each chamberGeneral assemblyLess than or equal to a preset rated total power consumption QForehead (forehead)The preset rated total power consumption QForehead (D)Accounts for the total electric quantity Q of the battery packBag (bag)1% to 20%, wherein the actual total power consumption
i is an integer greater than 1.
8. A temperature control system for a battery pack, comprising:
the temperature detection module is used for acquiring the current lowest temperature of the battery units in the battery pack to form a temperature signal;
the control module is in signal connection with the temperature detection module so as to compare the temperature signal with a first preset value and form a result signal;
the heating module is in signal connection with the control module, the control module controls the heating module to heat the battery unit according to the result signal, and the heating module needs to meet the requirements in the process of heating the battery unit: actual total power consumption Q of the heating moduleGeneral assemblyLess than or equal to a preset rated total power consumption QForehead (D)Said predetermined rated total power consumption QForehead (forehead)Accounts for the total electric quantity Q of the battery packBag (CN)1 to 20 percent of the total weight of the composition.
9. The temperature control system of a battery pack according to claim 7, wherein the temperature detection module includes a thermistor, and the control module includes a Battery Management System (BMS) and a relay, wherein:
the BMS is connected with the temperature detection module, receives a temperature signal and compares the temperature signal with a first preset value to form a result signal;
the relay is electrically connected with the BMS and is connected with the heating module so as to control the heating module to heat according to the result signal.
10. The temperature control system of a battery pack according to claim 9, wherein the heating module comprises at least one heating film.
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